‘Spacetime cloak’ can make time travel possibleNovember 16th, 2010 - 6:32 pm ICT by IANS
London, Nov 16 (IANS) A ’spacetime cloak’ may be straight out of science fiction, but some day it might permit time travel or change history.
A ‘cloaked’ individual could, for instance, travel from one place to another while appearing to vanish and appear instantaneously in a new location.
The device would speed up and slow down light to give the illusion that events have just not happened, according to the Journal of Optics.
For instance, a scientifically-savvy thief with access to technology could open a safe, empty its contents, and escape right under the watchful eye of a surveillance camera, reports the Daily Mail.
The video footage would show that the safe door was closed all the time. Scientists at Imperial College London have proved it could work in theory by adapting standard fibreoptic technology.
Lead scientist Martin McCall said: “We have shown that by manipulating the way the light illuminating an event reaches the viewer, it is possible to hide the passage of time.”
“If you had someone moving along the corridor, it would appear to a distant observer as if they had relocated instantaneously, creating the illusion of a Star Trek transporter. So, theoretically, this person might be able to do something and you wouldn’t notice,” McCall added.
The new research goes a step beyond ‘invisibility cloak’ technology by devising a way to conceal events as well as objects. This is achieved not by bending light, but by manipulating the speed at which light travels through a material medium.
Illuminating light is divided into an accelerated ‘leading part’ which arrives before an event, and a slowed ‘trailing half’ which lags behind and arrives after the event.
Both the fast and slow rays are joined back together and adjusted to the same speed before being seen by an observer.
The result is a concealed passage of time or ‘temporal void’ during which the event is not illuminated and goes unnoticed.
Graduate student Alberto Favaro, who also worked on the project, said: “It is unlike ordinary cloaking devices because it does not attempt to divert light around an object.”
- Star-Trek-style 'space-time invisibility cloak' comes a step closer - Nov 16, 2010
- Now, an 'illusion cloak' that shows you what's not there! - Feb 25, 2011
- Miniature invisibility 'carpet cloak' shows promise for the optical world - Apr 20, 2011
- An 'invisibility cloak' that really does hide things! - Nov 24, 2010
- 'Invisibility carpet' hides 'large' objects - Dec 16, 2010
- New 2D cloak that 'turns underwater objects invisible to sonar' - Jan 06, 2011
- Gravitational waves emanate as 'sounds of universe' - Oct 04, 2011
- Is the Star-trek style invisibility cloak finally a reality? - Feb 02, 2011
- New method tracks radiation levels faster - Nov 09, 2011
- Thinnest nanowire will make computing super fast - Sep 20, 2011
- Terahertz invisibility cloak created - Apr 28, 2011
- "Optical tweezers" to help development of advanced quantum computers - Jul 07, 2010
- Birds could better pilot-less aircraft - Oct 29, 2011
- A Time Traveller In Charlie Chaplin's Film? - Oct 28, 2010
- Airport Metro starts cloak-room service - Feb 28, 2012
Tags: , , , , , , , , , , , , , , , , , , ,